Pneumatic cushion



F. C. HILKER.

PNEUMATIC CUSHION.

APPLICATION FILED APR. 11. 1921.

Patented June 28, 1921.

STATEE PNEUMATIC CUSHION.

measles.

Specification oi Iiettcrs Patent.

Patented June 2& 192i.

Application filed. April 11, 1921.- Serial No. 460,567.

To all whom it may concern:

Be it known that I, FRANK C. HILKER, a citizen of the United States of America, and resident of Fort Wayne, in the county of Allen and State of Indiana, haveinvented certain new and useful improvements in Pneumatic Cushions. of which the following is a specification.

ihis invention relates to improvements in. pneumatic pillows and cushions and the object thereof is to construct a pneumatic sack in the form of a pillow or cushion so that when it is inflated it will tend to retain the flatness that is usual in the ordinary stuffed pillow case or cushion. inflated sacks commonly tend to loecome spherical or round when the pressure is sufficient to afiord the required support, and the present construction is such as to permit inflation of the saclr with air pressure sut'ficiently high as to afford the required support without distort- This object is accomplished by the construction illustrated in the accompanying a l a) a drawings in which igure i i a perspective view of the in- 'on inflated;

2 is vertical cross section of the 6 ig. 3 is plan view of the invention in a modfied form, a portion being shown broken away; and

r 1g. 41 is a similar view of the invention showing another modification thereof.

s characters of reference hereinafter app ringpertain to the parts described T designated by corresponding characters firmness than the outer lamina before the two are united and subjected to the final curing process, so that the inner lamina resists more than the outer lamina the tendency to bulge when the sack is inflated. As shown in F 1g. 2, the area of the inner lamina is restricted to the middle, portion of the sheet, and therefore the corresponding areas of the sack tend to remain flatter than the marginal portions thereof.

In the modified form shown in Fig. 3 the sheets 7 and 8 forming the sack are each provided with a series of interior strips 9 formed in the same manner as the inner lamina in the first instance; and in the modification shown in Fig. 4., the sheets 10 and 11, forming the sack, are each provided with a series of interior laminae 12 of a murder character but differing in shape and arrangement. in use, the sack is inflated with air through its" valve to a pressure suited to the supuort required of it, and may be inserted in a pillow-case or cushion cover {not shown) as s the usual custom. Aside from its useiulness as pillow and cushion, the invenmen may also serve in case of accident as a buoy when heating.

What ll claim is:

1.. A pneumatic suck for a pillow or cuslr ion formed of two sheets of rubber the ed es of which are united, and each sheet loci no" composed of lamina of different degrees oi stiffness, the lamina of greater stitinesshemg of less area than that of the other lamina.

in a device of the class described, a sack having a Valve and adapted to be inflated, the walls oi the each being formed of sheets each composed of laminm of different degrees of stiffness, the lamina of greater stid" ness being of less area than that oi the other and adapted to resist the tendency of the sack to bulge when inflated.

in testimony whereoi afi ir my signature, in presence of two witnesses.

FRANK C.

W i tnesses Marnnna lVQiET'iLER, Warren G. Scene. 

